Ext.onReady(function(){
if (document.getElementById('date_debut_location')) {
var mondate_deb = new Ext.form.DateField(
 {
      
        allowBlank:false,
        format:'d/m/Y',
        applyTo: 'date_debut_location'
         });
         mondate_deb.on ({
    'change' :function(d,newValue,oldValue){ 
         document.getElementById('date_debut_location').value=Ext.util.Format.date(newValue,'d/m/Y');
    }
    });
}
if (document.getElementById('date_fin_location')) {
var mondate_fin = new Ext.form.DateField(
 {
      
        allowBlank:false,
        format:'d/m/Y',
        applyTo: 'date_fin_location'
         });
         mondate_fin.on ({
    'change' :function(d,newValue,oldValue){ 
         document.getElementById('date_fin_location').value=Ext.util.Format.date(newValue,'d/m/Y');
    }
    });    
}
})